Hi guys, About 2 years ago I had a accident with some lily's on my window sill that left a 1 inch long mark on my projector screen .. I tried at the time to remove it with many things including white spirit .. Nothing worked.. I ended up touching it up with correction fluid which worked surprisingly well with the projector off you can hardly see it .. But I want a better solution as when the image is bright in this area it makes the touch up shine .. I think I might try some matt white emulation paint with a small brush .. The screen is a sapphire pure white retractable .. Any ideas ?